Farmbuddy, let's not forget that tracks are slow on the road, vibrate the heck out of the machine, and tear up the ground when you turn. And, if Cat had wanted to do combine tracks right, why not do a full set like the Bi-rotor or the old ClaasIJ I've been told they were simply too cheap to go first class, and now they have tires on the back anyway. Can you even get large tires on the rear yetIJ last I looked you couldn't.